At least 58 people were killed in the mass shooting during a country music festival. More than 500 were hospitalized, authorities said.

President Donald Trump has ordered American flags be flown at half-staff in honor of the victims

Moulton and his fellow Massachusetts Representative Katherine Clark refused to participate in a moment of silence following the 2016 Pulse Nightclub shooting in Orlando, Florida. They were protesting in favor of tighter gun control.

“As after Orlando, I will NOT be joining my colleagues in a moment of silence on the House Floor that just becomes an excuse for inaction,” Moulton tweeted on Monday morning.

As after #Orlando, I will NOT be joining my colleagues in a moment of silence on the House Floor that just becomes an excuse for inaction.